最新刊期
- “在高精度显示领域，研究者基于DQAO分子母核，设计了窄谱带深蓝光发射材料，为高性能发光材料设计提供新思路。”摘要：Based on the advantages of high color purity， multiresonance （MR） delayed fluorescence materials have attracted significant attention for their potential value in high-precision displays. This work took 12，12-dimethyl-4H-benzo［9，1］quinolino［3，4，5，6，7-defg］acridine-4，8（12H）-dione （DQAO） as the core skeleton， introducing sidechain groups with different electronic properties and performing virtual screening and fluorescence performance evaluation on molecular structures. A set of potential molecules with both narrow bands and deep blue emission were designed， and strategy for high-performance luminescent materials based on N/C=O was proposed. This study comprehensively evaluated the emission characteristics such as triplet-singlet energy splitting （ΔEST）， oscillator strength， and wavelength of over 70 candidates via quantum chemical methods. It was found that electron acceptors substituted at the N-position are conducive to enhancing oscillator strength and reducing reorganization energy （Eλ）， which estimates the full width at half maxima （FWHM） of the emission， while electron donors tend to reduce the ΔEST. The results of this study indicate that regulating the electronic properties of N-position substituents will significantly reduce the ΔEST of MR-TADF molecules， effectively enhance their oscillator strength， and achieve the desired emission wavelength， thereby realizing high-performance narrow-band emission characteristics. This study not only provides new molecular design ideas and effective structural data sets for the efficient design of MR-TADF molecules but also lays the theoretical foundation for further optimizing the performance of fluorescent materials based on the advantages of the N-position and the electronic properties of modifying groups.关键词：full width at half maxima;donor-acceptor;reorganization energy;virtual screening
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更新时间：2024-10-22 - “在夜视照明等领域，科研人员采用水热法制备了高效近红外荧光粉NaHF2：Cr3+，为设计高效发光材料提供新思路。”摘要：Broadband near-infrared phosphors converted light-emitting diode （pc-LED） is a novel solid-state light source， which has received extensive attention in the fields of night vision food testing， biological imaging， et al. Herein， a fluoride phosphor NaHF2：Cr3+ peaking at 761 nm with a full width at half maximum （FWHM） of ~112 nm is prepared via a facile hydrothermal method， exhibiting a high internal quantum efficiency （IQE） and external quantum efficiency （EQE） of 72.20% and 29.6%， respectively. Density functional theory （DFT） calculations and crystal structural analysis reveal that Cr3+ ions occupy the interstitial sites in NaHF2 to form a highly distorted octahedral ［CrF6］ environment， which is beneficial to relax part of the parity forbidden transition and realize highly efficient luminescence. Combining the phosphor NaHF2：Cr3+ and blue InGaN chip， a pc-LED with a maximum NIR output power of 426.74 mW@300 mA is demonstrated， which has promise in night vision. This work also provides new insights into the design of high efficiency near-infrared emission of Cr3+ activated phosphors.关键词：Phosphor-converted light-emitting diodes;near-infrared;NaHF2：Cr3+;night vision
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更新时间：2024-10-22 -
Growth control of quasi-two-dimensional perovskites: structure-dependent exciton and charge behavior 增强出版 AI导读
“In the field of optoelectronic devices, researchers have made significant progress in the study of quasi-two-dimensional perovskites. Expert xx explored the structure-dependent behavior of Q-2D perovskites, which provides solutions to enhance the performance of optoelectronic devices like solar cells and LEDs.”摘要：While three-dimensional perovskites have high defect tolerance and an adjustable bandgap， their charges tend to be free rather than forming excitons， making them unsuitable for efficient light-emitting diodes （LEDs）. Rather， quasi-two-dimensional （Q-2D） perovskites offer high photoluminescence quantum yield along with the advantages of bulk perovskites， making them ideal for high-performance LEDs. In Q-2D perovskites， the structure （which includes factors like crystal orientation， phase distribution， and layer thickness） directly influences how excitons and charge carriers behave within the material. Growth control techniques， such as varying the synthesis conditions or employing methods， allow to fine-tune the structural characteristics of these materials， which in turn affect exciton dynamics and charge transport. This review starts with a description of the basic properties of Q-2D perovskites， examines crystal growth in solution， explains how structure affects energy transfer behavior， and concludes with future directions for Q-2D perovskite LEDs. By understanding and optimizing the structure-dependent behavior， researchers can better control exciton dynamics and charge transport， which are crucial for enhancing the performance of optoelectronic devices like solar cells and LEDs.关键词：quasi-two-dimensional perovskites;light-emitting diodes;growth control;energy transfer- 4
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更新时间：2024-10-22 - “采用高温固相法制备了Ho3+掺杂YbNbO4荧光粉，研究了其发光性能和光学温度传感特性。”摘要：A series of YbNbO4 phosphors doped with x at.% Ho3+（x=1， 2， 5， 10， 15） were prepared by high temperature solid phase method. The synthesized sample was characterized by X-ray diffraction （XRD） and Fourier transform infrared spectroscopy （FT-IR）， and the results showed that the synthesized fluorescent powder sample had a monoclinic phase structure with a space group of I2/a. At the same time， the electronic structure （band and density of states） of the YbNbO4 matrix was calculated. YbNbO4 has a direct band gap with a bandgap width of 4.223 eV. Further investigation was conducted on the effect of Ho3+ ions doping concentration on emission spectra， and it was screened that a 2 at.% Ho3+ ions doping concentration had the best luminescence effect. In addition， samples doped with 2 at.% Ho3+ were excited at different powers. By fitting the emission peak to the excitation light power， it was further concluded that the upconversion of Ho3+ ions to red light at 666 nm （5F5→5I8） and green light at 543 nm （5S2/5F4→5I8） emission both belong to two-photon processes. In addition， based on the Fluorescence Intensity Ratio （LIR） technique， the temperature dependent spectra of 2 at.% Ho3+ doped samples were measured in the temperature range of 300-570 K， and the absolute sensitivity （Sa） and relative sensitivity （Sr） used to characterize the optical temperature sensing performance were calculated. The results showed that the Sr of the samples reached a maximum value of 0.36% K-1 at 420 K.关键词：upconversion luminescence;high temperature solid phase method;fluorescence intensity ratio;first principles calculation
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更新时间：2024-10-22 -
Recent advances in multi-dimensional control of upconversion emission from Er3+-riched nanocrystals 增强出版 AI导读
“高掺Er3+纳米晶上转换发光研究取得显著进展，专家深入解析发光性质调控策略，为光信息安全等领域提供新方向。”摘要：Over recent years， research into the upconversion luminescence properties of highly doped Er3+ nanocrystals has undergone rapid advancement. Compared to traditional doping materials， these materials exhibit unique features such as multi-band excitation， strong excitation wavelength penetration， dynamic control over optical color， and highly sensitive to external field stimuli， showing great promise in various research domains including optical information security， temperature sensing， and bioimaging. This review provides a comprehensive overview of the techniques for tuning upconversion luminescence intensity， emission colors， decay characteristics， and excitation bands through ways of such as matrix composition， structural design， and energy transfer processes. Additionally， we explore the impact of external field stimuli such as temperature， pressure， and metal surface electric fields on the luminescence properties of highly Er3+ doped nanocrystals. The mechanisms behind luminescence enhancement are discussed in terms of increased multiphoton transition probabilities and reduced non-radiative energy losses. Finally， we summarize the research on modulating excitation modes in highly doped Er3+ nanocrystals and propose directions for future investigations..关键词：heavily Er3+ doping;upconversion;multi-dimensional regulation;nanocrystals- 48
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更新时间：2024-10-17 - “在科学研究和工业领域，掺铽氟化物晶体激光器因其结构紧凑、转换效率高等优势，展现出广阔应用前景。专家分析了其发展历程，并展望了发展前景。”摘要：Terbium-doped fluoride crystal lasers have broad application prospects in the fields of scientific research and industry due to their ability to directly generate laser output covering the visible wavelength band of 500~700 nm， and their advantages of compact structure and high conversion efficiency compared with the traditional frequency conversion visible light lasers. Currently， the key to the development of terbium-doped fluoride crystal visible lasers is to scaling up the output power of the laser. In this paper， we firstly introduce terbium-doped fluoride crystal matrix， crystal structure， and spectral properties， and then focus on the development of terbium-doped fluoride crystal visible lasers based on frequency-doubled optically pumped semiconductor lasers （2ω-OPSLs） and visible laser diode （LD）-pumped lasers for continuous， pulsed， and deep-ultraviolet laser outputs. Finally， the current problems of terbium-doped fluoride crystal visible lasers are analyzed， and the development prospects of these lasers are analyzed.关键词：terbium-doped fluoride crystal;visible light laser;continuous laser;pulsed laser;deep-ultraviolet laser
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更新时间：2024-10-17 - “在发光材料领域，研究人员设计了新型3d-4f配合物，通过调节分子共轭性和3d-4f间距离，实现了单分子白光发射。”摘要：The tripyridine mono， bis and triphenyl bridged-β-dione ligands （SL3， DL3 and TL3） and their 3d-4f complexes （SL3-Zn-EU， DL3-Zn-EU and TL3-Zn-EU） were designed and prepared. It is found that SL3-Zn-Eu and DL3-Zn-Eu can emit characteristic red light of rare earth ion Eu3+ under ultraviolet excitation， and the chroma coordinates of both are： （0.67， 0.33）， but SL3-Zn-Eu has higher luminous intensity and quantum efficiency， mainly because the closer distance between 3d and 4f centers is favorable for 3d-4f energy transfer. However， the distance between the 3d and 4f centers in the TL3-Zn-Eu structure is longer， and the conjugate planes of the bridled benzene in the ligand distort with the increase of the number of bridled benzene rings， resulting in the blocked energy transfer of 3d→4f. The characteristic red light of Eu3+ and the residual green light of TL3-Zn can be detected from the fluorescence spectrum， and the luminous color falls in the white region with chrominance coordinates of （0.30， 0.29）. In conclusion， the 3d-4f complex designed in this paper can change the molecular conjugacy and the distance between 3d and 4f with the increase of the number of bridging benzene， thus adjusting the energy regulation efficiency.关键词：beta-dione;terpyridyl;rare earth characteristic luminescence;energy transfer;white light emitting material
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更新时间：2024-10-17 - “在照明和显示领域，有机发光二极管技术取得新突破。研究人员通过优化材料和器件结构，制备出高效率、低滚降的白光OLEDs，显色指数高达90，外量子效率达8.76%，为开发新型照明显示设备提供重要指导。”摘要：Organic light-emitting diodes （OLEDs） are attracting attention in recent years as a competitive technology in the field of lighting and display technology. To realize ultra-simple， efficient and low roll-off white OLEDs， the selection of organic emissive layer materials is crucial. The “hot exciton” channel of hybrid local and charge transfer （HLCT） materials ensure that high-lying triplet state excitons quickly transfer to singlet state by reverse intersystem crossing （RISC）， making that the exciton utilization rate reaches theoretical 100%， and the rapid RISC can effectively suppress triplet excitons quenching， further contribute to small efficiency roll-off. Herein， by charge balance strategy， we first prepared highly efficient blue OLEDs based on blue HLCT material of pCzAnN by optimizing device structure. On the basis of above， two-color and three-color white OLEDs were fabricated by incomplete energy transfer strategy based on pCzAnN as the sensitized host of traditional fluorescent material. The resulting white OLEDs achieves the high color rendering index of 90 and maximum external quantum efficiency of 8.76%， and such device also exhibits small efficiency roll-off and excellent spectra stability. This study provides a guidance for developing simple， highly efficient， small efficiency roll-off white OLEDs in the future， is of great significance.关键词：organic light emitting diode;white light;hybrid local and charge transfer;efficiency roll-off
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更新时间：2024-10-16 - “在荧光粉领域，专家总结了Mn4+激活氟化物荧光粉水解劣化的评价方法，为深入理解其劣化机制、开发耐水解劣化性更优的荧光粉提供科学依据。”摘要：Hydrolytic degradation is one of the main obstacles limiting the widespread application of Mn4+-activated fluoride red phosphors. Accurate characterization of the hydrolytic degradation behavior of Mn4+-activated fluoride phosphors is crucial for a deeper understanding of their degradation mechanisms and for developing fluoride phosphors with superior hydrolytic resistance. This review summarizes the methods for evaluating the hydrolytic degradation of Mn4+-activated fluoride phosphors， which are categorized into characterization of luminescence intensity/quantum efficiency （testing the luminescence intensity and quantum efficiency before and after treatment such as immersing in water， treating under 85℃/85% relative humidity condition， treating in boiling water， or treating in hydrothermal condition）， characterization of Mn valance on the particle surface （diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy）， and characterization of the dissolution properties of the phosphor （pH testing and conductivity testing of the solution after hydrolysis）. By presenting specific examples， this review introduces the characteristics of various evaluation methods， analyzes their advantages and disadvantages of each method， and finally provides a perspective on how to scientifically evaluate the hydrolytic degradation behavior of fluoride phosphors.关键词：Mn4+;fluoride;hydrolytic degradation;phosphor
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更新时间：2024-10-14 -
Modeling and simulation of Ga2O3/VO2 heterojunction devices based on VO2 phase transition regulation 增强出版 AI导读
“在光电探测器领域，研究者通过COMSOL multiphysics软件对Ga2O3/VO2异质结光电器件进行仿真，探索了其在光电探测器方面的应用，为进一步优化实验研究和应用提供数据支持。”摘要：In this paper， two-dimensional physical modeling and simulation of Ga2O3/VO2 heterojunction optoelectronic devices were carried out using COMSOL multiphysics software. The doping curve， energy level diagram， electric field distribution and potential distribution of Ga2O3/VO2 heterojunction optoelectronic devices based on VO2 phase transition regulation are analyzed and reported. The application of the device in photodetector is explored. The peak response rate is 0.068 A/W and the rejection ratio （R250nm/R450nm） reaches 105 orders under 1 V bias and 10 μW illumination conditions. The simulation data are helpful for further optimization of experimental research and application of Ga2O3/VO2 photodiodes.关键词：Ga2O3/VO2 heterojunction;COMSOL;VO2 phase transition;energy level structure;simulation- 109
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更新时间：2024-10-14 - “光致发光气凝胶结合气凝胶和发光材料特性，具有大比表面积、高孔隙度等优点，在传感、光电器件等领域应用广泛。”摘要：Photoluminescent aerogels， possessing the combined features of aerogels and luminescent materials， are a novel type of porous luminescent materials. Photoluminescent aerogels are characterized by unique properties， such as large specific surface area， high porosity， flexible structure， and controllable optical properties， and thus hold wide promise for diverse applications， particularly in sensing and optoelectronic devices. Focusing on photoluminescent aerogels， this review summarizes the preparation methods of aerogels， systematically introduces the aerogel according to the classification of luminescent centers， and discusses the application of the aerogel in the fields of sensing and optoelectronic devices. Finally， challenges and perspectives of photoluminescent aerogels are discussed.关键词：photoluminescence;aerogel;rare earth;nanocrystal
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更新时间：2024-10-12 - “在长余辉材料研究中，热释光测试揭示了其在生物成像、辐射探测等领域的应用潜力。专家总结了热释光动力学方程和陷阱深度估算方法，为材料性能优化提供理论依据。”摘要：Thermoluminescence measurement is the most important test item in the study of persistent luminescence materials. When the material is excited by high-energy rays， electrons are trapped in the trap， and these electrons are released under thermal excitation and then combined with the luminescent center， resulting in persistent luminescence. In recent years， researchers have carried out a lot of research on persistent luminescence materials in the fields of biological imaging， radiation dose detection and anti-counterfeiting. Thermal energy plays a key role in the decay of persistent luminescence. This paper will introduce the energy band model and thermoluminescence “first”， “second”， and “general” kinetic equations， and summarize several commonly used trap depth estimation methods， as well as our recently proposed simpler and more accurate trap depth estimation methods.关键词：thermoluminescence;persistent luminescence
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更新时间：2024-10-12 - “在癌症治疗领域，研究者开发了一种近红外光响应的温和光热治疗体系，通过降低热应激性HSP70表达，提高抗肿瘤效果，并实现肿瘤定位。”摘要：Cancer is among the most lethal diseases globally. Traditional treatment modalities like chemotherapy， radiotherapy， and surgery often fall short due to their limitations. Photothermal therapy （PTT）， which relies on the photothermal conversion effect of photothermal therapy agents （PTAs） to convert near-infrared energy into heat for cancer cell destruction， typically requires high temperatures that can damage adjacent normal tissues/organs. Mild photothermal therapy （mPTT） with a lower treatment temperature range （38-43 °C） is crucial for advancing PTT in tumor clinical treatment. However， even a minor temperature increase can induce heat stress in cancer cells and upregulate the expression of heat shock proteins （HSPs）， affecting mPTT's efficacy. To enhance mPTT's therapeutic effect， in this study， a near-infrared （NIR） fluorescence imaging-mediated and kinetic effect-induced NIR-responsive mPTT synergistic therapeutic system was designed using dendritic mesoporous silica-coated rare earth fluorescent nanocrystal nanocomposites （DCNP@DMSN） as the matrix material， modified with MnFe2O4 nano-enzymes on the surface and loaded with Indocyanine green （ICG） in the pore channels. DDMFI displays tumor microenvironment-responsive chemical kinetic effects and NIR-activated photodynamic effects. The generated reactive oxygen species and lipid peroxides can downregulate the expression of heat stress-induced HSP70 from low-temperature photothermal treatment， enabling kinetic effect-induced mPTT. In a 4T1 breast cancer model， it shows promising anti-tumor performance. Additionally， the platform has near-infrared second region fluorescence imaging functionality for in vivo tumor localization. Collectively， this approach holds great significance for the development of multifunctional integrated nano-platforms.关键词：photothermal therapy;photodynamic therapy;nanozyme;near infrared imaging;heat shock protein
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更新时间：2024-10-10 - “最新研究揭示，甲脒离子掺杂显著提升全无机钙钛矿CsPbBr3发光性能，为白光LED设计提供新思路。”摘要：Perovskite semiconductor materials， due to their excellent luminescent properties， tunable band gaps， ease of fabrication， and low cost， are widely regarded as having great potential for application in next-generation light-emitting diodes and semiconductor display devices. Inorganic perovskite quantum dots， represented by CsPbBr3， have attracted significant attention for their unique luminescent properties and have become a primary research focus. However， their luminescent performance and environmental stability still have certain limitations. This paper systematically studies the optimization of optical properties and stability of all-inorganic perovskite CsPbBr₃ through an organic cation doping strategy combined with steady-state and transient spectroscopic techniques. The research results show that FA+ doping significantly enhances the luminescent performance of CsPbBr3， with the strongest photoluminescence intensity observed when the FA+ proportion is 20%. Through temperature-dependent photoluminescence spectroscopy analysis， the exciton binding energy of Cs0.8FA0.2PbBr3 was determined to be 47.1 meV. FA+ doping reduces the longitudinal optical phonon energy of CsPbBr3， which helps lower the non-radiative transition rate and improves the photoluminescence quantum yield. Transient spectroscopy analysis indicates that， after the incorporation of FA⁺ into CsPbBr₃， the intraband hot exciton relaxation and non-radiative recombination are slowed down， resulting in an increase in the average photoluminescence lifetime from 13.68 ns to 19.56 ns， and an extension of exciton lifetime from 774.1 ps to 1319.2 ps. LEDs based on the synthesized Cs0.8FA0.2PbBr3 quantum dots exhibit stable emission and ideal white light， with chromaticity coordinates of （0.3784， 0.3163）. The research results confirm the feasibility of doping FA⁺ in regulating the optical properties of CsPbBr₃ quantum dots and provide valuable guidance for the design and application of white light-emitting diodes.关键词：organic-inorganic hybrid perovskite;formamidine ion doping;photoluminescence spectroscopy;transient spectroscopy;white-light LEDs
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更新时间：2024-10-08 - “在有机红光材料研究领域，科学家们设计并合成了新型D-A-A型材料TPA-BT-S和TPA-BT-D，实现了高效红光电致发光器件的制备，为全彩显示技术发展提供了新思路。”摘要：The development of new organic red emitters is of great importance for OLEDs and full-color displays. Two D-A-A´ type red emitters， named TPA-BT-S and TPA-BT-D， were designed and synthesized with triphenylamine as the electron donor （D）， benzothiadiazole and 2，6-diphenyl-3，5-dicyanopyridine as the electron acceptors （A）. In non-doped devices， the electroluminescent wavelengths of the two emitters are 618 nm and 610 nm， respectively， which are in the standard red light region. The maximum power efficiencies of the devices are 11.9 lmW-1 and 12.0 lmW-1， respectively；with maximum external quantum efficiencies of 6.36% and 5.32%， respectively. The exciton utilization of TPA-BT-S in the device reaches 33.7%. Those results demonstrate that emitters with hybrid local and charge-transfer states characteristic and D-A-A´ structure will exhibit high efficiency. Those provides a reference for the development of high-efficiency red emitters.关键词：benzothiadiazole;red emitter;HLCT;OLED
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更新时间：2024-09-29 - “最新研究揭示，通过精确控制壳层厚度，AIGS/AGS量子点实现高效绿色发光，为QLED技术发展提供新思路。”摘要：A series of AgInxGa1-xS2/AgGaS2 （AIGS/AGS） quantum dots （QDs） with varying shell thicknesses were synthesized by employing a technique that involves multiple rounds of alternate shell precursor injection. Using transmission electron microscopy （TEM） and X-ray diffraction （XRD） techniques， the morphology and crystal structure of the quantum dots were characterized in detail. Further， by employing absorption spectroscopy and photoluminescence （PL） spectroscopy， the impact of the AGS shell thickness on the luminescent properties of AIGS/AGS quantum dots was systematically analyzed. The experimental results indicate that appropriately increasing the AGS shell thickness enhances the band-edge emission of QDs， suppresses defect emission， and improves PL stability. Notably， the AIGS/AGS QDs with an optimal AGS shell thickness of 5 layers exhibit a pure green emission at 532 nm， a full width at half maximum （FWHM） of 33 nm， and a PL quantum yield （QY） of 45%. In term of light-emitting diode （LED） applications， the device achieves a maximum brightness of 1518 cd/m² and an external quantum efficiency （EQE） of 0.26%， demonstrating excellent potential for practical applications.关键词：Eco-friendly quantum dots;AIGS/AGS quantum dots;Shell thickness;optical properties;Band-edge Emiss
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更新时间：2024-09-26 - “在智能可穿戴设备和视觉交互传感领域，硫化锌基场致发光材料因其卓越性能成为研究热点。专家深入探讨了其发光机制、器件设计及应用，为未来发展指明方向。”摘要：In recent years， field luminescence （EL） technology has gained significant attention in the development of smart wearable devices and visual interaction sensing systems. Zinc sulfide （ZnS）-based field-emitting devices have emerged as key components in various application scenarios and visual interaction platforms due to their superior luminescence performance， high stability， and durability. This paper systematically reviews the properties of ZnS-based field-emission materials， with a comprehensive discussion of their luminescence mechanisms， device designs， and research applications. Particular attention is devoted to the latest advancements in ZnS-based field-emission fibers， highlighting their potential and challenges for future development.关键词：field emitting fibers;flexible;display;smart wearable
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更新时间：2024-09-21 - “在医疗诊断和工业检测领域，单晶钙钛矿X射线探测器因其高灵敏度和稳定性受到关注。研究进展表明，通过优化结晶质量、材料组分和器件设计，可显著提升其性能，为未来技术发展提供新方向。”摘要：X-ray detection has been extensively used in medical diagnosis， security inspection， and industrial non-destructive detection etc. In recent years， metal halide perovskite X-ray detectors have attracted much attention due to their advantages such as high sensitivity， low detection limit and low cost. Compared with polycrystalline perovskite films， single crystal perovskites exhibit much lower trap density， higher carrier mobility-lifetime product， better uniformity and stability due to absence of grain boundaries， which are conducive to boost the performance of X-ray detectors. In this review， we first introduce the basic principle and the key performance parameters of X-ray detection to clarify the advantages of single crystal perovskite for direct X-ray detectors. Then， we review the research progress of single crystal perovskite direct X-ray detection and imaging. Specifically， the influence of crystal quality， composition regulation and structure of device of the single crystal perovskite on X-ray detection performance are systematically analyzed. Finally， we discussed the technical challenges and potential solutions faced by single crystal perovskite X-ray detectors， and provided a brief outlook on the development trends in the field.关键词：single crystal perovskite;direct X-ray detection;crystallization quality;composition regulation;device structure
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更新时间：2024-09-18 -
Enhanced near-infrared II emission in MgAl
x Ga2-x O4: Ni2+ phosphor via Al/Ga Ions Substitution 增强出版 AI导读“在成像和检测领域，科学家们通过高温固相法制备了新型MgAlxGa2-xO4：Ni2+荧光材料，实现了高效近红外二区发光，为光谱技术应用带来新突破。”摘要：Near-infrared （NIR）-II phosphors converted light-emitting diodes （NIR pc-LEDs） are ideal NIR sources for versatile applications. There is an urgent requirement to explore the NIR-II luminescent materials. Herein， we have successfully synthesized MgAlxGa2-xO4 phosphor materials via a high-temperature solid-state method. The Ni2+ activated MgAlxGa2-xO4 exhibits an excitation wavelength of 390 nm and an emission peak at 1300 nm， covering the NIR-II region. This ultra-broadband emission is due to Ni²⁺ in a weak crystal field environment， which caused by spatially asymmetric distortions from high-charge polarization around the ［（Al/Ga）O6］ octahedral centers. A simple cation modulation strategy （Al/Ga） is proposed to successfully largely enhance the NIR-emission intensity 9 times as much as before. An optimized Al/Ga ratio in MgAlxGa2-xO4 system and the corresponding thermal stability were studied. Further， a NIR pc-LED is fabricated by employing MgAl1.5Ga0.5O4：Ni2+ coating on a 395 nm LED chip， showcasing its promising application prospects in NIR pc-LED.关键词：phosphor;Ni2+ doped;cation substitution;NIR pc-LED- 35
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更新时间：2024-09-13 - “在生物医学领域，科学家们通过热注入法成功制备了Yb3+-Er3+共掺溴化铯铅钙钛矿纳米晶体，实现了近红外光激发下的上转换发光现象。”摘要：Yb3+- Er3+ co-doped all inorganic cesium lead bromide perovskite nanocrystals were prepared by hot injection method. The photoluminescence properties and crystal structure were characterized by Transmission Electron Microscopic， fluorescence spectrum and X-ray Diffraction. The experimental results show that Yb3+- Er3+ co-doped all inorganic perovskite nanocrystal emit bright green light （540 nm） and red light （646 nm） under the excitation of near-infrared light. In addition， it was found in the experimental process that the morphologies tuning of the Yb3+- Er3+ co-doped perovskite bromide nanostructures i.e. quantum dots， nanotubes， nanorods， nanoflowers， nanobelts， nanosheets have been successfully achieved by controlling reaction temperature， the temperature injected by the precursor and the proportion of the complexing agent and solvent. For Yb3+- Er3+ co-doped perovskite nanocrystals with different morphology， the phenomenon of Yb3+ sensitization Er3+ luminescence was observed under the excitation of near-infrared light， which is due to the existence of Yb3+- Er3+ energy transfer. Rare earth doping of perovskite materials can realize the up-conversion luminescence phenomenon under the excitation of near-infrared light， which is beneficial to the application of perovskite family materials in biomedical field.关键词：perovskite nanostructures;lanthanide;near-infrared excitation;upconverting luminescence
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更新时间：2024-09-12
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